A photo of Jacob Taylor Roberts is posted below as Lt. Adam Phillips answers questions Wednesday about the shooting at Clackamas Town Center in Portland, Ore.

Written by

Rachel La Corte
and Jonathan J. Cooper

The gunman who killed two people and himself in a shooting rampage at an Oregon mall used a rifle stolen from someone he knew, authorities said Wednesday.

Jacob Tyler Roberts, 22, had armed himself with an AR-15 semiautomatic rifle and had several magazines of ammunition when he arrived at a suburban Portland mall on Tuesday, said Clackamas County Sheriff Craig Roberts.

The sheriff said the rifle jammed during the attack, but the gunman managed to get it working again. He later shot himself. Authorities don't yet have a motive but don't believe he was targeting specific people. ...